Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

None of these
Overall gas transfer units to the number of ideal trays required
Ideal trays required to the number of real trays required
Real trays required to the number of ideal trays required

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Process Equipment and Plant Design
Liquid gradient over a tray can be minimised by

Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must
Using split flow, radial flow or cascade flow for column diameter large than 4 ft
All of these
Providing a higher skirt clearance or a higher weir

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